Here's me, high school freshman, channeling Evel on my Honda 90. So in metal shop, my year older and supposedly wiser friend Mark thought we needed to extend the swing arm for better handling. And he's in gas welding class, no rod, just coat hangers. So we cut the tubing mid span and found some pipe the same diameter. "Shouldn't we find some pipe to go inside too?", says I, 'cause even at that age I had extended bicycle forks and such. "No" says Mark, "the weld is stronger than the surrounding metal". And I have to admit, his coat hanger gas welding looked pretty darn good. However it was not to be, fore the next time out to the jumps it broke completely in two at the welds, leaving both the bike and I crumpled in the dirt. Fortunately young bones heal quick and Honda 90 parts were abundant.